New tools for home inspectors in 2018 the united states geological survey usgs announced the development of a new tool for home inspectors hoping to identify dangerous vermiculite.
Perlite insulation attic.
Vermiculite and perlite insulation materials are commonly found as attic insulation in homes built before 1950.
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Fiberglass rigid foam and other insulating materials have largely replaced granular fill insulation in attics and wall cavities within residential structures.
Perlite insulation is an inorganic product that does not support combustion or rot nor does it provide a habitat for rodents.
In addition to improving thermal resistance perlite insulation also blocks unwanted noise to keep the inside of the home quieter.
Perlite including perlite building insulation is a non fibrous non asbestos containing material which has an r value of about 2 7 per inch and would not be expected to contain asbestos.
Why perlite works.
If there s gray brown pebbly insulation on the attic floor it most likely contains enough asbestos to be a hazard to the people living there.
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Process insulating walls sediment perlite is produced with the following features.
Environmental protection agency asbestos is not intrinsic to vermiculite.
The solution in the form of plaster with perlite is used for lining a belt type foundation with the basement or cellar.
Existing insulation 5 fiberglass 4 plywood 5 wood 5.
Vermiculite insulation materials aren t widely used today because they sometimes contain asbestos.
Perlite is a type of rock a form of volcanic glass which is mined crushed heated and thus expanded 4 to 20 x original volume to form an inorganic insulating material.
This material is particularly popular as a form of loose fill attic insulation.
Many builders and homeowners rely on perlite insulation to block unwanted airflow in walls roofs and foundations.
It is ideal for use under concrete slabs in chimneys and in high temperature applications such as pizza ovens and rocket stoves.
Perlite insulation is suitable for home whose walls are made of bricks or blocks.
However according to the u s.
The physical character of expanded perlite lends itself to a variety of special purposes including use as loose fill masonry insulation.
